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Update to the latest version 6.5: Keeping Lightroom Up-to-Date
If the issue persists, try to reset preferences: http://lightroom-blog.com/2015/05/23/resetting-preferences-in-lightroom-cc6/
Thank you for your help. I now have 6.5 (2015.5) installed. I also found that if I uncheck "Auto Align" and "Auto Tone", the problem seems to go away.
It should work with these features enabled as well.
Did you try to reset the preferences?
I have now reset the preferences and it has solved the problem. Thank you for your help.